Comments on: A Very Special Ten-Digit Number
https://blog.tanyakhovanova.com/2008/06/a-very-special-ten-digit-number/
Mathematics, applications of mathematics to life in general, and my life as a mathematician.Fri, 26 Sep 2014 18:22:15 +0000
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By: Tanya Khovanova’s Math Blog » Blog Archive » It Has Been Two Years
https://blog.tanyakhovanova.com/2008/06/a-very-special-ten-digit-number/#comment-96
Fri, 11 Dec 2009 15:20:12 +0000https://blog.tanyakhovanova.com/?p=31#comment-96[…] A Very Special Ten-Digit Number […]
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By: Walking Randomly » The 46th Carnival of Mathematics - the last one of 2008.
https://blog.tanyakhovanova.com/2008/06/a-very-special-ten-digit-number/#comment-95
Mon, 29 Dec 2008 22:42:36 +0000https://blog.tanyakhovanova.com/?p=31#comment-95[…] No Carnival is complete without a puzzle to solve and Tanya Khovanova gave us a great one back in […]
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By: pianowow
https://blog.tanyakhovanova.com/2008/06/a-very-special-ten-digit-number/#comment-94
Fri, 05 Sep 2008 15:26:18 +0000https://blog.tanyakhovanova.com/?p=31#comment-94Took me about an hour of eliminating results based on divisibility rules here: https://mathforum.org/dr.math/faq/faq.divisibility.html
I got 3816547290 for Conway’s puzzle.
For your puzzle, I had to write a computer program, and got 9123567480.
Thanks for the intriguing puzzle!
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By: Ken Roberts
https://blog.tanyakhovanova.com/2008/06/a-very-special-ten-digit-number/#comment-93
Thu, 04 Sep 2008 18:25:11 +0000https://blog.tanyakhovanova.com/?p=31#comment-93Fun puzzle. Bit of reasoning deals with all but the div-by-7 case, and then used brute force trying all 8 possibilities.
Has anyone found a way to reason thru to the solution without need for division in the div-by-7 test?
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By: An Answer To “A Very Special Ten-Digit Number” | Finer Recliner
https://blog.tanyakhovanova.com/2008/06/a-very-special-ten-digit-number/#comment-92
Thu, 04 Sep 2008 15:50:40 +0000https://blog.tanyakhovanova.com/?p=31#comment-92[…] Khovanova poses an interesting math question on her blog: This puzzle was given to me by John H. Conway, and he heard it from someone […]
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